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Finding the Fourth Proportional to 123,479.72, 170,346.40 and 72,495.60

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Solution

The fourth proportional to 123,479.72, 170,346.40 and 72,495.60 is: 100,011.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,479.72 : 170,346.40 = 72,495.60 : x
  2. Step 2: Convert to fraction form
    123,479.72/170,346.40 = 72,495.60/x
  3. Step 3: Cross multiply
    123,479.72x = 170,346.40 × 72,495.60
  4. Step 4: Simplify right side
    123,479.72x = 12,349,364,475.84
  5. Step 5: Solve for x
    x = 12,349,364,475.84/123,479.72
  6. Step 6: Final answer
    x = 100,011.28

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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.