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Finding the Fourth Proportional to 287,918.70, 402,561.30 and 287,918.70

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Solution

The fourth proportional to 287,918.70, 402,561.30 and 287,918.70 is: 402,561.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,918.70 : 402,561.30 = 287,918.70 : x
  2. Step 2: Convert to fraction form
    287,918.70/402,561.30 = 287,918.70/x
  3. Step 3: Cross multiply
    287,918.70x = 402,561.30 × 287,918.70
  4. Step 4: Simplify right side
    287,918.70x = 115,904,926,166.31
  5. Step 5: Solve for x
    x = 115,904,926,166.31/287,918.70
  6. Step 6: Final answer
    x = 402,561.30

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.