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Finding the Fourth Proportional to 988, 1,364 and 678.08

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Solution

The fourth proportional to 988, 1,364 and 678.08 is: 936.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    988 : 1,364 = 678.08 : x
  2. Step 2: Convert to fraction form
    988/1,364 = 678.08/x
  3. Step 3: Cross multiply
    988x = 1,364 × 678.08
  4. Step 4: Simplify right side
    988x = 924,901.12
  5. Step 5: Solve for x
    x = 924,901.12/988
  6. Step 6: Final answer
    x = 936.13

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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.