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Finding the Fourth Proportional to 1,039.60, 1,559.55 and 346.30

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Solution

The fourth proportional to 1,039.60, 1,559.55 and 346.30 is: 519.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.60 : 1,559.55 = 346.30 : x
  2. Step 2: Convert to fraction form
    1,039.60/1,559.55 = 346.30/x
  3. Step 3: Cross multiply
    1,039.60x = 1,559.55 × 346.30
  4. Step 4: Simplify right side
    1,039.60x = 540,072.17
  5. Step 5: Solve for x
    x = 540,072.17/1,039.60
  6. Step 6: Final answer
    x = 519.50

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Double scale
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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.