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Finding the Fourth Proportional to 870.32, 1,200.43 and 555.67

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Solution

The fourth proportional to 870.32, 1,200.43 and 555.67 is: 766.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.32 : 1,200.43 = 555.67 : x
  2. Step 2: Convert to fraction form
    870.32/1,200.43 = 555.67/x
  3. Step 3: Cross multiply
    870.32x = 1,200.43 × 555.67
  4. Step 4: Simplify right side
    870.32x = 667,042.94
  5. Step 5: Solve for x
    x = 667,042.94/870.32
  6. Step 6: Final answer
    x = 766.43

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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.