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Finding the Fourth Proportional to 840.89, 1,158.78 and 619.46

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Solution

The fourth proportional to 840.89, 1,158.78 and 619.46 is: 853.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.89 : 1,158.78 = 619.46 : x
  2. Step 2: Convert to fraction form
    840.89/1,158.78 = 619.46/x
  3. Step 3: Cross multiply
    840.89x = 1,158.78 × 619.46
  4. Step 4: Simplify right side
    840.89x = 717,818.73
  5. Step 5: Solve for x
    x = 717,818.73/840.89
  6. Step 6: Final answer
    x = 853.64

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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.