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Finding the Fourth Proportional to 1,079.77, 1,490.06 and 607.70

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Solution

The fourth proportional to 1,079.77, 1,490.06 and 607.70 is: 838.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.77 : 1,490.06 = 607.70 : x
  2. Step 2: Convert to fraction form
    1,079.77/1,490.06 = 607.70/x
  3. Step 3: Cross multiply
    1,079.77x = 1,490.06 × 607.70
  4. Step 4: Simplify right side
    1,079.77x = 905,509.46
  5. Step 5: Solve for x
    x = 905,509.46/1,079.77
  6. Step 6: Final answer
    x = 838.61

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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.