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Finding the Fourth Proportional to 1,010.68, 1,395.22 and 678.98

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Solution

The fourth proportional to 1,010.68, 1,395.22 and 678.98 is: 937.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.68 : 1,395.22 = 678.98 : x
  2. Step 2: Convert to fraction form
    1,010.68/1,395.22 = 678.98/x
  3. Step 3: Cross multiply
    1,010.68x = 1,395.22 × 678.98
  4. Step 4: Simplify right side
    1,010.68x = 947,326.48
  5. Step 5: Solve for x
    x = 947,326.48/1,010.68
  6. Step 6: Final answer
    x = 937.32

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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.