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Finding the Fourth Proportional to 1,039.41, 1,558.80 and 345.87

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Solution

The fourth proportional to 1,039.41, 1,558.80 and 345.87 is: 518.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.41 : 1,558.80 = 345.87 : x
  2. Step 2: Convert to fraction form
    1,039.41/1,558.80 = 345.87/x
  3. Step 3: Cross multiply
    1,039.41x = 1,558.80 × 345.87
  4. Step 4: Simplify right side
    1,039.41x = 539,142.16
  5. Step 5: Solve for x
    x = 539,142.16/1,039.41
  6. Step 6: Final answer
    x = 518.70

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1.5x scale

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.