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Finding the Fourth Proportional to 478,555.52, 660,428.16 and 287,657.60

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Solution

The fourth proportional to 478,555.52, 660,428.16 and 287,657.60 is: 396,980.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,555.52 : 660,428.16 = 287,657.60 : x
  2. Step 2: Convert to fraction form
    478,555.52/660,428.16 = 287,657.60/x
  3. Step 3: Cross multiply
    478,555.52x = 660,428.16 × 287,657.60
  4. Step 4: Simplify right side
    478,555.52x = 189,977,179,478.02
  5. Step 5: Solve for x
    x = 189,977,179,478.02/478,555.52
  6. Step 6: Final answer
    x = 396,980.44

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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.