Home / 78,831.40-118,247.10-77,276.20

Finding the Fourth Proportional to 78,831.40, 118,247.10 and 77,276.20

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Solution

The fourth proportional to 78,831.40, 118,247.10 and 77,276.20 is: 115,914.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,831.40 : 118,247.10 = 77,276.20 : x
  2. Step 2: Convert to fraction form
    78,831.40/118,247.10 = 77,276.20/x
  3. Step 3: Cross multiply
    78,831.40x = 118,247.10 × 77,276.20
  4. Step 4: Simplify right side
    78,831.40x = 9,137,686,549.02
  5. Step 5: Solve for x
    x = 9,137,686,549.02/78,831.40
  6. Step 6: Final answer
    x = 115,914.30

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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.