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Finding the Fourth Proportional to 909.48, 1,255.20 and 555.60

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Solution

The fourth proportional to 909.48, 1,255.20 and 555.60 is: 766.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.48 : 1,255.20 = 555.60 : x
  2. Step 2: Convert to fraction form
    909.48/1,255.20 = 555.60/x
  3. Step 3: Cross multiply
    909.48x = 1,255.20 × 555.60
  4. Step 4: Simplify right side
    909.48x = 697,389.12
  5. Step 5: Solve for x
    x = 697,389.12/909.48
  6. Step 6: Final answer
    x = 766.80

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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.