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Finding the Fourth Proportional to 1,307.79, 1,803.78 and 1,229.45

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Solution

The fourth proportional to 1,307.79, 1,803.78 and 1,229.45 is: 1,695.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.79 : 1,803.78 = 1,229.45 : x
  2. Step 2: Convert to fraction form
    1,307.79/1,803.78 = 1,229.45/x
  3. Step 3: Cross multiply
    1,307.79x = 1,803.78 × 1,229.45
  4. Step 4: Simplify right side
    1,307.79x = 2,217,648.30
  5. Step 5: Solve for x
    x = 2,217,648.30/1,307.79
  6. Step 6: Final answer
    x = 1,695.72

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1.5x scale

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.