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Finding the Fourth Proportional to 108,717.72, 149,961.42 and 78,547.38

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Solution

The fourth proportional to 108,717.72, 149,961.42 and 78,547.38 is: 108,345.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,717.72 : 149,961.42 = 78,547.38 : x
  2. Step 2: Convert to fraction form
    108,717.72/149,961.42 = 78,547.38/x
  3. Step 3: Cross multiply
    108,717.72x = 149,961.42 × 78,547.38
  4. Step 4: Simplify right side
    108,717.72x = 11,779,076,642.08
  5. Step 5: Solve for x
    x = 11,779,076,642.08/108,717.72
  6. Step 6: Final answer
    x = 108,345.51

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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.