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Finding the Fourth Proportional to 1,061.76, 1,465.14 and 619.65

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Solution

The fourth proportional to 1,061.76, 1,465.14 and 619.65 is: 855.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.76 : 1,465.14 = 619.65 : x
  2. Step 2: Convert to fraction form
    1,061.76/1,465.14 = 619.65/x
  3. Step 3: Cross multiply
    1,061.76x = 1,465.14 × 619.65
  4. Step 4: Simplify right side
    1,061.76x = 907,872.84
  5. Step 5: Solve for x
    x = 907,872.84/1,061.76
  6. Step 6: Final answer
    x = 855.07

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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.