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Finding the Fourth Proportional to 387,811.92, 535,051.80 and 316,068.60

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Solution

The fourth proportional to 387,811.92, 535,051.80 and 316,068.60 is: 436,069.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,811.92 : 535,051.80 = 316,068.60 : x
  2. Step 2: Convert to fraction form
    387,811.92/535,051.80 = 316,068.60/x
  3. Step 3: Cross multiply
    387,811.92x = 535,051.80 × 316,068.60
  4. Step 4: Simplify right side
    387,811.92x = 169,113,073,353.48
  5. Step 5: Solve for x
    x = 169,113,073,353.48/387,811.92
  6. Step 6: Final answer
    x = 436,069.82

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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.