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Finding the Fourth Proportional to 98,915.78, 136,509.72 and 60,679.64

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Solution

The fourth proportional to 98,915.78, 136,509.72 and 60,679.64 is: 83,741.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,915.78 : 136,509.72 = 60,679.64 : x
  2. Step 2: Convert to fraction form
    98,915.78/136,509.72 = 60,679.64/x
  3. Step 3: Cross multiply
    98,915.78x = 136,509.72 × 60,679.64
  4. Step 4: Simplify right side
    98,915.78x = 8,283,360,666.10
  5. Step 5: Solve for x
    x = 8,283,360,666.10/98,915.78
  6. Step 6: Final answer
    x = 83,741.55

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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.