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Finding the Fourth Proportional to 631,301.60, 870,289.92 and 389,421.12

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Solution

The fourth proportional to 631,301.60, 870,289.92 and 389,421.12 is: 536,842.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,301.60 : 870,289.92 = 389,421.12 : x
  2. Step 2: Convert to fraction form
    631,301.60/870,289.92 = 389,421.12/x
  3. Step 3: Cross multiply
    631,301.60x = 870,289.92 × 389,421.12
  4. Step 4: Simplify right side
    631,301.60x = 338,909,275,371.11
  5. Step 5: Solve for x
    x = 338,909,275,371.11/631,301.60
  6. Step 6: Final answer
    x = 536,842.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.