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Finding the Fourth Proportional to 261,130.50, 391,088.25 and 253,947.15

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Solution

The fourth proportional to 261,130.50, 391,088.25 and 253,947.15 is: 380,329.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,130.50 : 391,088.25 = 253,947.15 : x
  2. Step 2: Convert to fraction form
    261,130.50/391,088.25 = 253,947.15/x
  3. Step 3: Cross multiply
    261,130.50x = 391,088.25 × 253,947.15
  4. Step 4: Simplify right side
    261,130.50x = 99,315,746,485.99
  5. Step 5: Solve for x
    x = 99,315,746,485.99/261,130.50
  6. Step 6: Final answer
    x = 380,329.94

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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.