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Finding the Fourth Proportional to 910.51, 1,256.10 and 615.67

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Solution

The fourth proportional to 910.51, 1,256.10 and 615.67 is: 849.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.51 : 1,256.10 = 615.67 : x
  2. Step 2: Convert to fraction form
    910.51/1,256.10 = 615.67/x
  3. Step 3: Cross multiply
    910.51x = 1,256.10 × 615.67
  4. Step 4: Simplify right side
    910.51x = 773,343.09
  5. Step 5: Solve for x
    x = 773,343.09/910.51
  6. Step 6: Final answer
    x = 849.35

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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.