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Finding the Fourth Proportional to 1,125.39, 1,688.31 and 345.34

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Solution

The fourth proportional to 1,125.39, 1,688.31 and 345.34 is: 518.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.39 : 1,688.31 = 345.34 : x
  2. Step 2: Convert to fraction form
    1,125.39/1,688.31 = 345.34/x
  3. Step 3: Cross multiply
    1,125.39x = 1,688.31 × 345.34
  4. Step 4: Simplify right side
    1,125.39x = 583,040.98
  5. Step 5: Solve for x
    x = 583,040.98/1,125.39
  6. Step 6: Final answer
    x = 518.08

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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.