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Finding the Fourth Proportional to 100,088.79, 138,172.51 and 57,639.12

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Solution

The fourth proportional to 100,088.79, 138,172.51 and 57,639.12 is: 79,570.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,088.79 : 138,172.51 = 57,639.12 : x
  2. Step 2: Convert to fraction form
    100,088.79/138,172.51 = 57,639.12/x
  3. Step 3: Cross multiply
    100,088.79x = 138,172.51 × 57,639.12
  4. Step 4: Simplify right side
    100,088.79x = 7,964,141,884.59
  5. Step 5: Solve for x
    x = 7,964,141,884.59/100,088.79
  6. Step 6: Final answer
    x = 79,570.77

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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.