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Finding the Fourth Proportional to 61,154.40, 91,731.60 and 51,312.90

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Solution

The fourth proportional to 61,154.40, 91,731.60 and 51,312.90 is: 76,969.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,154.40 : 91,731.60 = 51,312.90 : x
  2. Step 2: Convert to fraction form
    61,154.40/91,731.60 = 51,312.90/x
  3. Step 3: Cross multiply
    61,154.40x = 91,731.60 × 51,312.90
  4. Step 4: Simplify right side
    61,154.40x = 4,707,014,417.64
  5. Step 5: Solve for x
    x = 4,707,014,417.64/61,154.40
  6. Step 6: Final answer
    x = 76,969.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.