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Finding the Fourth Proportional to 40,643.36, 60,916.32 and 20,931.20

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Solution

The fourth proportional to 40,643.36, 60,916.32 and 20,931.20 is: 31,371.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,643.36 : 60,916.32 = 20,931.20 : x
  2. Step 2: Convert to fraction form
    40,643.36/60,916.32 = 20,931.20/x
  3. Step 3: Cross multiply
    40,643.36x = 60,916.32 × 20,931.20
  4. Step 4: Simplify right side
    40,643.36x = 1,275,051,677.18
  5. Step 5: Solve for x
    x = 1,275,051,677.18/40,643.36
  6. Step 6: Final answer
    x = 31,371.71

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1.5x scale

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.