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Finding the Fourth Proportional to 387,712.40, 581,645.40 and 325,811.60

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Solution

The fourth proportional to 387,712.40, 581,645.40 and 325,811.60 is: 488,781.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,712.40 : 581,645.40 = 325,811.60 : x
  2. Step 2: Convert to fraction form
    387,712.40/581,645.40 = 325,811.60/x
  3. Step 3: Cross multiply
    387,712.40x = 581,645.40 × 325,811.60
  4. Step 4: Simplify right side
    387,712.40x = 189,506,818,406.64
  5. Step 5: Solve for x
    x = 189,506,818,406.64/387,712.40
  6. Step 6: Final answer
    x = 488,781.94

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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.