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Finding the Fourth Proportional to 741.15, 1,021.95 and 630.99

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Solution

The fourth proportional to 741.15, 1,021.95 and 630.99 is: 870.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.15 : 1,021.95 = 630.99 : x
  2. Step 2: Convert to fraction form
    741.15/1,021.95 = 630.99/x
  3. Step 3: Cross multiply
    741.15x = 1,021.95 × 630.99
  4. Step 4: Simplify right side
    741.15x = 644,840.23
  5. Step 5: Solve for x
    x = 644,840.23/741.15
  6. Step 6: Final answer
    x = 870.05

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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.