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Finding the Fourth Proportional to 261,559.80, 392,339.70 and 128,525.40

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Solution

The fourth proportional to 261,559.80, 392,339.70 and 128,525.40 is: 192,788.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,559.80 : 392,339.70 = 128,525.40 : x
  2. Step 2: Convert to fraction form
    261,559.80/392,339.70 = 128,525.40/x
  3. Step 3: Cross multiply
    261,559.80x = 392,339.70 × 128,525.40
  4. Step 4: Simplify right side
    261,559.80x = 50,425,616,878.38
  5. Step 5: Solve for x
    x = 50,425,616,878.38/261,559.80
  6. Step 6: Final answer
    x = 192,788.10

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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.