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Finding the Fourth Proportional to 910.61, 1,256.70 and 512.30

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Solution

The fourth proportional to 910.61, 1,256.70 and 512.30 is: 707.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.61 : 1,256.70 = 512.30 : x
  2. Step 2: Convert to fraction form
    910.61/1,256.70 = 512.30/x
  3. Step 3: Cross multiply
    910.61x = 1,256.70 × 512.30
  4. Step 4: Simplify right side
    910.61x = 643,812.47
  5. Step 5: Solve for x
    x = 643,812.47/910.61
  6. Step 6: Final answer
    x = 707.01

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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.