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Finding the Fourth Proportional to 261,762.60, 392,643.90 and 128,663.40

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Solution

The fourth proportional to 261,762.60, 392,643.90 and 128,663.40 is: 192,995.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,762.60 : 392,643.90 = 128,663.40 : x
  2. Step 2: Convert to fraction form
    261,762.60/392,643.90 = 128,663.40/x
  3. Step 3: Cross multiply
    261,762.60x = 392,643.90 × 128,663.40
  4. Step 4: Simplify right side
    261,762.60x = 50,518,899,163.26
  5. Step 5: Solve for x
    x = 50,518,899,163.26/261,762.60
  6. Step 6: Final answer
    x = 192,995.10

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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.