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Finding the Fourth Proportional to 61,689.81, 85,275.42 and 55,041.33

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Solution

The fourth proportional to 61,689.81, 85,275.42 and 55,041.33 is: 76,085.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,689.81 : 85,275.42 = 55,041.33 : x
  2. Step 2: Convert to fraction form
    61,689.81/85,275.42 = 55,041.33/x
  3. Step 3: Cross multiply
    61,689.81x = 85,275.42 × 55,041.33
  4. Step 4: Simplify right side
    61,689.81x = 4,693,672,533.11
  5. Step 5: Solve for x
    x = 4,693,672,533.11/61,689.81
  6. Step 6: Final answer
    x = 76,085.05

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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.