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Finding the Fourth Proportional to 910.32, 1,256.16 and 561.12

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Solution

The fourth proportional to 910.32, 1,256.16 and 561.12 is: 774.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.32 : 1,256.16 = 561.12 : x
  2. Step 2: Convert to fraction form
    910.32/1,256.16 = 561.12/x
  3. Step 3: Cross multiply
    910.32x = 1,256.16 × 561.12
  4. Step 4: Simplify right side
    910.32x = 704,856.50
  5. Step 5: Solve for x
    x = 704,856.50/910.32
  6. Step 6: Final answer
    x = 774.30

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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.