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Finding the Fourth Proportional to 265,718.40, 398,440.80 and 78,705.60

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Solution

The fourth proportional to 265,718.40, 398,440.80 and 78,705.60 is: 118,017.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    265,718.40 : 398,440.80 = 78,705.60 : x
  2. Step 2: Convert to fraction form
    265,718.40/398,440.80 = 78,705.60/x
  3. Step 3: Cross multiply
    265,718.40x = 398,440.80 × 78,705.60
  4. Step 4: Simplify right side
    265,718.40x = 31,359,522,228.48
  5. Step 5: Solve for x
    x = 31,359,522,228.48/265,718.40
  6. Step 6: Final answer
    x = 118,017.88

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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.