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Finding the Fourth Proportional to 767.40, 1,058.99 and 505.23

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Solution

The fourth proportional to 767.40, 1,058.99 and 505.23 is: 697.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.40 : 1,058.99 = 505.23 : x
  2. Step 2: Convert to fraction form
    767.40/1,058.99 = 505.23/x
  3. Step 3: Cross multiply
    767.40x = 1,058.99 × 505.23
  4. Step 4: Simplify right side
    767.40x = 535,030.99
  5. Step 5: Solve for x
    x = 535,030.99/767.40
  6. Step 6: Final answer
    x = 697.20

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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.