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Finding the Fourth Proportional to 981.90, 1,355.03 and 603.74

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Solution

The fourth proportional to 981.90, 1,355.03 and 603.74 is: 833.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.90 : 1,355.03 = 603.74 : x
  2. Step 2: Convert to fraction form
    981.90/1,355.03 = 603.74/x
  3. Step 3: Cross multiply
    981.90x = 1,355.03 × 603.74
  4. Step 4: Simplify right side
    981.90x = 818,090.71
  5. Step 5: Solve for x
    x = 818,090.71/981.90
  6. Step 6: Final answer
    x = 833.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.