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Finding the Fourth Proportional to 521,386.80, 782,080.20 and 166,412.40

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Solution

The fourth proportional to 521,386.80, 782,080.20 and 166,412.40 is: 249,618.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,386.80 : 782,080.20 = 166,412.40 : x
  2. Step 2: Convert to fraction form
    521,386.80/782,080.20 = 166,412.40/x
  3. Step 3: Cross multiply
    521,386.80x = 782,080.20 × 166,412.40
  4. Step 4: Simplify right side
    521,386.80x = 130,147,843,074.48
  5. Step 5: Solve for x
    x = 130,147,843,074.48/521,386.80
  6. Step 6: Final answer
    x = 249,618.60

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.