Home / 78,385.28-117,580.16-19,220.90

Finding the Fourth Proportional to 78,385.28, 117,580.16 and 19,220.90

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Solution

The fourth proportional to 78,385.28, 117,580.16 and 19,220.90 is: 28,831.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,385.28 : 117,580.16 = 19,220.90 : x
  2. Step 2: Convert to fraction form
    78,385.28/117,580.16 = 19,220.90/x
  3. Step 3: Cross multiply
    78,385.28x = 117,580.16 × 19,220.90
  4. Step 4: Simplify right side
    78,385.28x = 2,259,996,401.24
  5. Step 5: Solve for x
    x = 2,259,996,401.24/78,385.28
  6. Step 6: Final answer
    x = 28,831.90

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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.