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Finding the Fourth Proportional to 121,779.16, 167,946.04 and 101,428.78

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Solution

The fourth proportional to 121,779.16, 167,946.04 and 101,428.78 is: 139,880.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,779.16 : 167,946.04 = 101,428.78 : x
  2. Step 2: Convert to fraction form
    121,779.16/167,946.04 = 101,428.78/x
  3. Step 3: Cross multiply
    121,779.16x = 167,946.04 × 101,428.78
  4. Step 4: Simplify right side
    121,779.16x = 17,034,561,943.03
  5. Step 5: Solve for x
    x = 17,034,561,943.03/121,779.16
  6. Step 6: Final answer
    x = 139,880.76

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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.