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Finding the Fourth Proportional to 767.79, 1,058.87 and 558.65

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Solution

The fourth proportional to 767.79, 1,058.87 and 558.65 is: 770.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.79 : 1,058.87 = 558.65 : x
  2. Step 2: Convert to fraction form
    767.79/1,058.87 = 558.65/x
  3. Step 3: Cross multiply
    767.79x = 1,058.87 × 558.65
  4. Step 4: Simplify right side
    767.79x = 591,541.77
  5. Step 5: Solve for x
    x = 591,541.77/767.79
  6. Step 6: Final answer
    x = 770.45

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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.