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Finding the Fourth Proportional to 261,347.20, 392,225.60 and 121,123.20

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Solution

The fourth proportional to 261,347.20, 392,225.60 and 121,123.20 is: 181,779.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,347.20 : 392,225.60 = 121,123.20 : x
  2. Step 2: Convert to fraction form
    261,347.20/392,225.60 = 121,123.20/x
  3. Step 3: Cross multiply
    261,347.20x = 392,225.60 × 121,123.20
  4. Step 4: Simplify right side
    261,347.20x = 47,507,619,793.92
  5. Step 5: Solve for x
    x = 47,507,619,793.92/261,347.20
  6. Step 6: Final answer
    x = 181,779.72

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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.