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Finding the Fourth Proportional to 261,639.60, 392,621.40 and 103,851.60

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Solution

The fourth proportional to 261,639.60, 392,621.40 and 103,851.60 is: 155,841.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,639.60 : 392,621.40 = 103,851.60 : x
  2. Step 2: Convert to fraction form
    261,639.60/392,621.40 = 103,851.60/x
  3. Step 3: Cross multiply
    261,639.60x = 392,621.40 × 103,851.60
  4. Step 4: Simplify right side
    261,639.60x = 40,774,360,584.24
  5. Step 5: Solve for x
    x = 40,774,360,584.24/261,639.60
  6. Step 6: Final answer
    x = 155,841.70

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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.