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Finding the Fourth Proportional to 390,356.60, 585,534.90 and 291,212.60

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Solution

The fourth proportional to 390,356.60, 585,534.90 and 291,212.60 is: 436,818.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,356.60 : 585,534.90 = 291,212.60 : x
  2. Step 2: Convert to fraction form
    390,356.60/585,534.90 = 291,212.60/x
  3. Step 3: Cross multiply
    390,356.60x = 585,534.90 × 291,212.60
  4. Step 4: Simplify right side
    390,356.60x = 170,515,140,619.74
  5. Step 5: Solve for x
    x = 170,515,140,619.74/390,356.60
  6. Step 6: Final answer
    x = 436,818.90

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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.