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Finding the Fourth Proportional to 910.14, 1,256.02 and 645.06

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Solution

The fourth proportional to 910.14, 1,256.02 and 645.06 is: 890.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.14 : 1,256.02 = 645.06 : x
  2. Step 2: Convert to fraction form
    910.14/1,256.02 = 645.06/x
  3. Step 3: Cross multiply
    910.14x = 1,256.02 × 645.06
  4. Step 4: Simplify right side
    910.14x = 810,208.26
  5. Step 5: Solve for x
    x = 810,208.26/910.14
  6. Step 6: Final answer
    x = 890.20

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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.