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Finding the Fourth Proportional to 387,808.89, 581,713.50 and 121,590.15

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Solution

The fourth proportional to 387,808.89, 581,713.50 and 121,590.15 is: 182,385.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,808.89 : 581,713.50 = 121,590.15 : x
  2. Step 2: Convert to fraction form
    387,808.89/581,713.50 = 121,590.15/x
  3. Step 3: Cross multiply
    387,808.89x = 581,713.50 × 121,590.15
  4. Step 4: Simplify right side
    387,808.89x = 70,730,631,722.03
  5. Step 5: Solve for x
    x = 70,730,631,722.03/387,808.89
  6. Step 6: Final answer
    x = 182,385.28

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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.