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Finding the Fourth Proportional to 642.84, 887.12 and 348.10

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Solution

The fourth proportional to 642.84, 887.12 and 348.10 is: 480.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.84 : 887.12 = 348.10 : x
  2. Step 2: Convert to fraction form
    642.84/887.12 = 348.10/x
  3. Step 3: Cross multiply
    642.84x = 887.12 × 348.10
  4. Step 4: Simplify right side
    642.84x = 308,803.82
  5. Step 5: Solve for x
    x = 308,803.82/642.84
  6. Step 6: Final answer
    x = 480.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.