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Finding the Fourth Proportional to 387,788.76, 581,690.50 and 121,543.40

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Solution

The fourth proportional to 387,788.76, 581,690.50 and 121,543.40 is: 182,317.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,788.76 : 581,690.50 = 121,543.40 : x
  2. Step 2: Convert to fraction form
    387,788.76/581,690.50 = 121,543.40/x
  3. Step 3: Cross multiply
    387,788.76x = 581,690.50 × 121,543.40
  4. Step 4: Simplify right side
    387,788.76x = 70,700,641,117.70
  5. Step 5: Solve for x
    x = 70,700,641,117.70/387,788.76
  6. Step 6: Final answer
    x = 182,317.41

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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.