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Finding the Fourth Proportional to 387,785.76, 581,686 and 121,540.40

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Solution

The fourth proportional to 387,785.76, 581,686 and 121,540.40 is: 182,312.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,785.76 : 581,686 = 121,540.40 : x
  2. Step 2: Convert to fraction form
    387,785.76/581,686 = 121,540.40/x
  3. Step 3: Cross multiply
    387,785.76x = 581,686 × 121,540.40
  4. Step 4: Simplify right side
    387,785.76x = 70,698,349,114.40
  5. Step 5: Solve for x
    x = 70,698,349,114.40/387,785.76
  6. Step 6: Final answer
    x = 182,312.91

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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.