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Finding the Fourth Proportional to 560.79, 841.05 and 387.45

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Solution

The fourth proportional to 560.79, 841.05 and 387.45 is: 581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    560.79 : 841.05 = 387.45 : x
  2. Step 2: Convert to fraction form
    560.79/841.05 = 387.45/x
  3. Step 3: Cross multiply
    560.79x = 841.05 × 387.45
  4. Step 4: Simplify right side
    560.79x = 325,864.82
  5. Step 5: Solve for x
    x = 325,864.82/560.79
  6. Step 6: Final answer
    x = 581.08

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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.