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Finding the Fourth Proportional to 85,530.40, 128,425.20 and 65,831.20

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Solution

The fourth proportional to 85,530.40, 128,425.20 and 65,831.20 is: 98,846.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,530.40 : 128,425.20 = 65,831.20 : x
  2. Step 2: Convert to fraction form
    85,530.40/128,425.20 = 65,831.20/x
  3. Step 3: Cross multiply
    85,530.40x = 128,425.20 × 65,831.20
  4. Step 4: Simplify right side
    85,530.40x = 8,454,385,026.24
  5. Step 5: Solve for x
    x = 8,454,385,026.24/85,530.40
  6. Step 6: Final answer
    x = 98,846.55

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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.