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Finding the Fourth Proportional to 261,043.60, 390,787.80 and 155,808.40

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Solution

The fourth proportional to 261,043.60, 390,787.80 and 155,808.40 is: 233,248.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,043.60 : 390,787.80 = 155,808.40 : x
  2. Step 2: Convert to fraction form
    261,043.60/390,787.80 = 155,808.40/x
  3. Step 3: Cross multiply
    261,043.60x = 390,787.80 × 155,808.40
  4. Step 4: Simplify right side
    261,043.60x = 60,888,021,857.52
  5. Step 5: Solve for x
    x = 60,888,021,857.52/261,043.60
  6. Step 6: Final answer
    x = 233,248.48

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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.