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Finding the Fourth Proportional to 77,686.62, 107,213.15 and 47,477.72

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Solution

The fourth proportional to 77,686.62, 107,213.15 and 47,477.72 is: 65,522.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,686.62 : 107,213.15 = 47,477.72 : x
  2. Step 2: Convert to fraction form
    77,686.62/107,213.15 = 47,477.72/x
  3. Step 3: Cross multiply
    77,686.62x = 107,213.15 × 47,477.72
  4. Step 4: Simplify right side
    77,686.62x = 5,090,235,916.02
  5. Step 5: Solve for x
    x = 5,090,235,916.02/77,686.62
  6. Step 6: Final answer
    x = 65,522.68

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1.5x scale

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.