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Finding the Fourth Proportional to 287,417.60, 431,126.40 and 100,404.80

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Solution

The fourth proportional to 287,417.60, 431,126.40 and 100,404.80 is: 150,607.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,417.60 : 431,126.40 = 100,404.80 : x
  2. Step 2: Convert to fraction form
    287,417.60/431,126.40 = 100,404.80/x
  3. Step 3: Cross multiply
    287,417.60x = 431,126.40 × 100,404.80
  4. Step 4: Simplify right side
    287,417.60x = 43,287,159,966.72
  5. Step 5: Solve for x
    x = 43,287,159,966.72/287,417.60
  6. Step 6: Final answer
    x = 150,607.20

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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.