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Finding the Fourth Proportional to 977.93, 1,348.80 and 623.92

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Solution

The fourth proportional to 977.93, 1,348.80 and 623.92 is: 860.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.93 : 1,348.80 = 623.92 : x
  2. Step 2: Convert to fraction form
    977.93/1,348.80 = 623.92/x
  3. Step 3: Cross multiply
    977.93x = 1,348.80 × 623.92
  4. Step 4: Simplify right side
    977.93x = 841,543.30
  5. Step 5: Solve for x
    x = 841,543.30/977.93
  6. Step 6: Final answer
    x = 860.54

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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.