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Finding the Fourth Proportional to 699.59, 1,048.58 and 391.58

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Solution

The fourth proportional to 699.59, 1,048.58 and 391.58 is: 586.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.59 : 1,048.58 = 391.58 : x
  2. Step 2: Convert to fraction form
    699.59/1,048.58 = 391.58/x
  3. Step 3: Cross multiply
    699.59x = 1,048.58 × 391.58
  4. Step 4: Simplify right side
    699.59x = 410,595.76
  5. Step 5: Solve for x
    x = 410,595.76/699.59
  6. Step 6: Final answer
    x = 586.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.