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Finding the Fourth Proportional to 287,999.30, 402,265.90 and 287,999.30

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Solution

The fourth proportional to 287,999.30, 402,265.90 and 287,999.30 is: 402,265.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,999.30 : 402,265.90 = 287,999.30 : x
  2. Step 2: Convert to fraction form
    287,999.30/402,265.90 = 287,999.30/x
  3. Step 3: Cross multiply
    287,999.30x = 402,265.90 × 287,999.30
  4. Step 4: Simplify right side
    287,999.30x = 115,852,297,613.87
  5. Step 5: Solve for x
    x = 115,852,297,613.87/287,999.30
  6. Step 6: Final answer
    x = 402,265.90

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1.5x scale

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.