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Finding the Fourth Proportional to 261,987.51, 392,972.94 and 72,459.30

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Solution

The fourth proportional to 261,987.51, 392,972.94 and 72,459.30 is: 108,686.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,987.51 : 392,972.94 = 72,459.30 : x
  2. Step 2: Convert to fraction form
    261,987.51/392,972.94 = 72,459.30/x
  3. Step 3: Cross multiply
    261,987.51x = 392,972.94 × 72,459.30
  4. Step 4: Simplify right side
    261,987.51x = 28,474,544,151.34
  5. Step 5: Solve for x
    x = 28,474,544,151.34/261,987.51
  6. Step 6: Final answer
    x = 108,686.65

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1.5x scale

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.