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Finding the Fourth Proportional to 1,010.70, 1,395.18 and 661.50

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Solution

The fourth proportional to 1,010.70, 1,395.18 and 661.50 is: 913.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.70 : 1,395.18 = 661.50 : x
  2. Step 2: Convert to fraction form
    1,010.70/1,395.18 = 661.50/x
  3. Step 3: Cross multiply
    1,010.70x = 1,395.18 × 661.50
  4. Step 4: Simplify right side
    1,010.70x = 922,911.57
  5. Step 5: Solve for x
    x = 922,911.57/1,010.70
  6. Step 6: Final answer
    x = 913.14

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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.