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Finding the Fourth Proportional to 780.90, 1,077.43 and 466.15

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Solution

The fourth proportional to 780.90, 1,077.43 and 466.15 is: 643.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.90 : 1,077.43 = 466.15 : x
  2. Step 2: Convert to fraction form
    780.90/1,077.43 = 466.15/x
  3. Step 3: Cross multiply
    780.90x = 1,077.43 × 466.15
  4. Step 4: Simplify right side
    780.90x = 502,243.99
  5. Step 5: Solve for x
    x = 502,243.99/780.90
  6. Step 6: Final answer
    x = 643.16

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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.