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Finding the Fourth Proportional to 1,358.93, 2,038.98 and 920.68

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Solution

The fourth proportional to 1,358.93, 2,038.98 and 920.68 is: 1,381.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.93 : 2,038.98 = 920.68 : x
  2. Step 2: Convert to fraction form
    1,358.93/2,038.98 = 920.68/x
  3. Step 3: Cross multiply
    1,358.93x = 2,038.98 × 920.68
  4. Step 4: Simplify right side
    1,358.93x = 1,877,243.01
  5. Step 5: Solve for x
    x = 1,877,243.01/1,358.93
  6. Step 6: Final answer
    x = 1,381.41

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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.