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Finding the Fourth Proportional to 909.24, 1,254.24 and 647.64

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Solution

The fourth proportional to 909.24, 1,254.24 and 647.64 is: 893.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.24 : 1,254.24 = 647.64 : x
  2. Step 2: Convert to fraction form
    909.24/1,254.24 = 647.64/x
  3. Step 3: Cross multiply
    909.24x = 1,254.24 × 647.64
  4. Step 4: Simplify right side
    909.24x = 812,295.99
  5. Step 5: Solve for x
    x = 812,295.99/909.24
  6. Step 6: Final answer
    x = 893.38

Related Problems

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Half scale
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Double scale
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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.