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Finding the Fourth Proportional to 840.24, 1,158.80 and 644.16

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Solution

The fourth proportional to 840.24, 1,158.80 and 644.16 is: 888.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.24 : 1,158.80 = 644.16 : x
  2. Step 2: Convert to fraction form
    840.24/1,158.80 = 644.16/x
  3. Step 3: Cross multiply
    840.24x = 1,158.80 × 644.16
  4. Step 4: Simplify right side
    840.24x = 746,452.61
  5. Step 5: Solve for x
    x = 746,452.61/840.24
  6. Step 6: Final answer
    x = 888.38

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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.