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Finding the Fourth Proportional to 261,639.60, 392,459.40 and 258,140.40

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Solution

The fourth proportional to 261,639.60, 392,459.40 and 258,140.40 is: 387,210.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,639.60 : 392,459.40 = 258,140.40 : x
  2. Step 2: Convert to fraction form
    261,639.60/392,459.40 = 258,140.40/x
  3. Step 3: Cross multiply
    261,639.60x = 392,459.40 × 258,140.40
  4. Step 4: Simplify right side
    261,639.60x = 101,309,626,499.76
  5. Step 5: Solve for x
    x = 101,309,626,499.76/261,639.60
  6. Step 6: Final answer
    x = 387,210.60

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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.