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Finding the Fourth Proportional to 145,989.30, 201,465.15 and 78,921.30

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Solution

The fourth proportional to 145,989.30, 201,465.15 and 78,921.30 is: 108,911.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,989.30 : 201,465.15 = 78,921.30 : x
  2. Step 2: Convert to fraction form
    145,989.30/201,465.15 = 78,921.30/x
  3. Step 3: Cross multiply
    145,989.30x = 201,465.15 × 78,921.30
  4. Step 4: Simplify right side
    145,989.30x = 15,899,891,542.70
  5. Step 5: Solve for x
    x = 15,899,891,542.70/145,989.30
  6. Step 6: Final answer
    x = 108,911.35

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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.