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Finding the Fourth Proportional to 1,038.70, 1,557.78 and 694.45

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Solution

The fourth proportional to 1,038.70, 1,557.78 and 694.45 is: 1,041.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.70 : 1,557.78 = 694.45 : x
  2. Step 2: Convert to fraction form
    1,038.70/1,557.78 = 694.45/x
  3. Step 3: Cross multiply
    1,038.70x = 1,557.78 × 694.45
  4. Step 4: Simplify right side
    1,038.70x = 1,081,800.32
  5. Step 5: Solve for x
    x = 1,081,800.32/1,038.70
  6. Step 6: Final answer
    x = 1,041.49

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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.