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Finding the Fourth Proportional to 901.30, 1,240.81 and 790.60

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Solution

The fourth proportional to 901.30, 1,240.81 and 790.60 is: 1,088.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.30 : 1,240.81 = 790.60 : x
  2. Step 2: Convert to fraction form
    901.30/1,240.81 = 790.60/x
  3. Step 3: Cross multiply
    901.30x = 1,240.81 × 790.60
  4. Step 4: Simplify right side
    901.30x = 980,984.39
  5. Step 5: Solve for x
    x = 980,984.39/901.30
  6. Step 6: Final answer
    x = 1,088.41

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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.