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Finding the Fourth Proportional to 1,275.06, 1,913.30 and 690.05

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Solution

The fourth proportional to 1,275.06, 1,913.30 and 690.05 is: 1,035.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.06 : 1,913.30 = 690.05 : x
  2. Step 2: Convert to fraction form
    1,275.06/1,913.30 = 690.05/x
  3. Step 3: Cross multiply
    1,275.06x = 1,913.30 × 690.05
  4. Step 4: Simplify right side
    1,275.06x = 1,320,259.65
  5. Step 5: Solve for x
    x = 1,320,259.65/1,275.06
  6. Step 6: Final answer
    x = 1,035.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.