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Finding the Fourth Proportional to 981.03, 1,354.07 and 607.79

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Solution

The fourth proportional to 981.03, 1,354.07 and 607.79 is: 838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.03 : 1,354.07 = 607.79 : x
  2. Step 2: Convert to fraction form
    981.03/1,354.07 = 607.79/x
  3. Step 3: Cross multiply
    981.03x = 1,354.07 × 607.79
  4. Step 4: Simplify right side
    981.03x = 822,980.40
  5. Step 5: Solve for x
    x = 822,980.40/981.03
  6. Step 6: Final answer
    x = 838.89

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1.5x scale

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.