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Finding the Fourth Proportional to 387,810.66, 535,113.50 and 215,706.18

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Solution

The fourth proportional to 387,810.66, 535,113.50 and 215,706.18 is: 297,638.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,810.66 : 535,113.50 = 215,706.18 : x
  2. Step 2: Convert to fraction form
    387,810.66/535,113.50 = 215,706.18/x
  3. Step 3: Cross multiply
    387,810.66x = 535,113.50 × 215,706.18
  4. Step 4: Simplify right side
    387,810.66x = 115,427,287,872.90
  5. Step 5: Solve for x
    x = 115,427,287,872.90/387,810.66
  6. Step 6: Final answer
    x = 297,638.25

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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.