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Finding the Fourth Proportional to 100,622.76, 138,872.58 and 64,916.64

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Solution

The fourth proportional to 100,622.76, 138,872.58 and 64,916.64 is: 89,593.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,622.76 : 138,872.58 = 64,916.64 : x
  2. Step 2: Convert to fraction form
    100,622.76/138,872.58 = 64,916.64/x
  3. Step 3: Cross multiply
    100,622.76x = 138,872.58 × 64,916.64
  4. Step 4: Simplify right side
    100,622.76x = 9,015,141,038.29
  5. Step 5: Solve for x
    x = 9,015,141,038.29/100,622.76
  6. Step 6: Final answer
    x = 89,593.46

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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.