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Finding the Fourth Proportional to 810.09, 1,117.13 and 515.25

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Solution

The fourth proportional to 810.09, 1,117.13 and 515.25 is: 710.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.09 : 1,117.13 = 515.25 : x
  2. Step 2: Convert to fraction form
    810.09/1,117.13 = 515.25/x
  3. Step 3: Cross multiply
    810.09x = 1,117.13 × 515.25
  4. Step 4: Simplify right side
    810.09x = 575,598.66
  5. Step 5: Solve for x
    x = 575,598.66/810.09
  6. Step 6: Final answer
    x = 710.54

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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.