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Finding the Fourth Proportional to 988.67, 1,363.54 and 740.58

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Solution

The fourth proportional to 988.67, 1,363.54 and 740.58 is: 1,021.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.67 : 1,363.54 = 740.58 : x
  2. Step 2: Convert to fraction form
    988.67/1,363.54 = 740.58/x
  3. Step 3: Cross multiply
    988.67x = 1,363.54 × 740.58
  4. Step 4: Simplify right side
    988.67x = 1,009,810.45
  5. Step 5: Solve for x
    x = 1,009,810.45/988.67
  6. Step 6: Final answer
    x = 1,021.38

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Double scale
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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.