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Finding the Fourth Proportional to 615.40, 847.16 and 553.23

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Solution

The fourth proportional to 615.40, 847.16 and 553.23 is: 761.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.40 : 847.16 = 553.23 : x
  2. Step 2: Convert to fraction form
    615.40/847.16 = 553.23/x
  3. Step 3: Cross multiply
    615.40x = 847.16 × 553.23
  4. Step 4: Simplify right side
    615.40x = 468,673.64
  5. Step 5: Solve for x
    x = 468,673.64/615.40
  6. Step 6: Final answer
    x = 761.58

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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.