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Finding the Fourth Proportional to 485,421.40, 728,132.10 and 402,477.40

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Solution

The fourth proportional to 485,421.40, 728,132.10 and 402,477.40 is: 603,716.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,421.40 : 728,132.10 = 402,477.40 : x
  2. Step 2: Convert to fraction form
    485,421.40/728,132.10 = 402,477.40/x
  3. Step 3: Cross multiply
    485,421.40x = 728,132.10 × 402,477.40
  4. Step 4: Simplify right side
    485,421.40x = 293,056,714,464.54
  5. Step 5: Solve for x
    x = 293,056,714,464.54/485,421.40
  6. Step 6: Final answer
    x = 603,716.10

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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.