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Finding the Fourth Proportional to 261,278.40, 391,334.40 and 201,646.20

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Solution

The fourth proportional to 261,278.40, 391,334.40 and 201,646.20 is: 302,019.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,278.40 : 391,334.40 = 201,646.20 : x
  2. Step 2: Convert to fraction form
    261,278.40/391,334.40 = 201,646.20/x
  3. Step 3: Cross multiply
    261,278.40x = 391,334.40 × 201,646.20
  4. Step 4: Simplify right side
    261,278.40x = 78,911,094,689.28
  5. Step 5: Solve for x
    x = 78,911,094,689.28/261,278.40
  6. Step 6: Final answer
    x = 302,019.21

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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.