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Finding the Fourth Proportional to 887.42, 1,225.02 and 555.78

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Solution

The fourth proportional to 887.42, 1,225.02 and 555.78 is: 767.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.42 : 1,225.02 = 555.78 : x
  2. Step 2: Convert to fraction form
    887.42/1,225.02 = 555.78/x
  3. Step 3: Cross multiply
    887.42x = 1,225.02 × 555.78
  4. Step 4: Simplify right side
    887.42x = 680,841.62
  5. Step 5: Solve for x
    x = 680,841.62/887.42
  6. Step 6: Final answer
    x = 767.21

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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.