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Finding the Fourth Proportional to 261,430.30, 392,404.65 and 128,460.70

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Solution

The fourth proportional to 261,430.30, 392,404.65 and 128,460.70 is: 192,818.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,430.30 : 392,404.65 = 128,460.70 : x
  2. Step 2: Convert to fraction form
    261,430.30/392,404.65 = 128,460.70/x
  3. Step 3: Cross multiply
    261,430.30x = 392,404.65 × 128,460.70
  4. Step 4: Simplify right side
    261,430.30x = 50,408,576,022.26
  5. Step 5: Solve for x
    x = 50,408,576,022.26/261,430.30
  6. Step 6: Final answer
    x = 192,818.41

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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.