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Finding the Fourth Proportional to 886.76, 1,223.90 and 555.40

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Solution

The fourth proportional to 886.76, 1,223.90 and 555.40 is: 766.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.76 : 1,223.90 = 555.40 : x
  2. Step 2: Convert to fraction form
    886.76/1,223.90 = 555.40/x
  3. Step 3: Cross multiply
    886.76x = 1,223.90 × 555.40
  4. Step 4: Simplify right side
    886.76x = 679,754.06
  5. Step 5: Solve for x
    x = 679,754.06/886.76
  6. Step 6: Final answer
    x = 766.56

Related Problems

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Half scale
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Double scale
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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.