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Finding the Fourth Proportional to 909.16, 1,355.45 and 821.68

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Solution

The fourth proportional to 909.16, 1,355.45 and 821.68 is: 1,225.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.16 : 1,355.45 = 821.68 : x
  2. Step 2: Convert to fraction form
    909.16/1,355.45 = 821.68/x
  3. Step 3: Cross multiply
    909.16x = 1,355.45 × 821.68
  4. Step 4: Simplify right side
    909.16x = 1,113,746.16
  5. Step 5: Solve for x
    x = 1,113,746.16/909.16
  6. Step 6: Final answer
    x = 1,225.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.