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Finding the Fourth Proportional to 972.75, 1,342.40 and 623.91

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Solution

The fourth proportional to 972.75, 1,342.40 and 623.91 is: 861.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.75 : 1,342.40 = 623.91 : x
  2. Step 2: Convert to fraction form
    972.75/1,342.40 = 623.91/x
  3. Step 3: Cross multiply
    972.75x = 1,342.40 × 623.91
  4. Step 4: Simplify right side
    972.75x = 837,533.66
  5. Step 5: Solve for x
    x = 837,533.66/972.75
  6. Step 6: Final answer
    x = 861.00

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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.