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Finding the Fourth Proportional to 972.91, 1,342.47 and 579.93

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Solution

The fourth proportional to 972.91, 1,342.47 and 579.93 is: 800.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.91 : 1,342.47 = 579.93 : x
  2. Step 2: Convert to fraction form
    972.91/1,342.47 = 579.93/x
  3. Step 3: Cross multiply
    972.91x = 1,342.47 × 579.93
  4. Step 4: Simplify right side
    972.91x = 778,538.63
  5. Step 5: Solve for x
    x = 778,538.63/972.91
  6. Step 6: Final answer
    x = 800.22

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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.