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Finding the Fourth Proportional to 978.32, 1,348.97 and 623.77

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Solution

The fourth proportional to 978.32, 1,348.97 and 623.77 is: 860.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.32 : 1,348.97 = 623.77 : x
  2. Step 2: Convert to fraction form
    978.32/1,348.97 = 623.77/x
  3. Step 3: Cross multiply
    978.32x = 1,348.97 × 623.77
  4. Step 4: Simplify right side
    978.32x = 841,437.15
  5. Step 5: Solve for x
    x = 841,437.15/978.32
  6. Step 6: Final answer
    x = 860.09

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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.