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Finding the Fourth Proportional to 261,329.40, 392,068.56 and 128,249.64

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Solution

The fourth proportional to 261,329.40, 392,068.56 and 128,249.64 is: 192,411.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,329.40 : 392,068.56 = 128,249.64 : x
  2. Step 2: Convert to fraction form
    261,329.40/392,068.56 = 128,249.64/x
  3. Step 3: Cross multiply
    261,329.40x = 392,068.56 × 128,249.64
  4. Step 4: Simplify right side
    261,329.40x = 50,282,651,675.32
  5. Step 5: Solve for x
    x = 50,282,651,675.32/261,329.40
  6. Step 6: Final answer
    x = 192,411.00

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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.