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Finding the Fourth Proportional to 560.56, 839.40 and 432.40

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Solution

The fourth proportional to 560.56, 839.40 and 432.40 is: 647.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.56 : 839.40 = 432.40 : x
  2. Step 2: Convert to fraction form
    560.56/839.40 = 432.40/x
  3. Step 3: Cross multiply
    560.56x = 839.40 × 432.40
  4. Step 4: Simplify right side
    560.56x = 362,956.56
  5. Step 5: Solve for x
    x = 362,956.56/560.56
  6. Step 6: Final answer
    x = 647.49

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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.