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Finding the Fourth Proportional to 485.19, 669.53 and 288.77

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Solution

The fourth proportional to 485.19, 669.53 and 288.77 is: 398.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.19 : 669.53 = 288.77 : x
  2. Step 2: Convert to fraction form
    485.19/669.53 = 288.77/x
  3. Step 3: Cross multiply
    485.19x = 669.53 × 288.77
  4. Step 4: Simplify right side
    485.19x = 193,337.55
  5. Step 5: Solve for x
    x = 193,337.55/485.19
  6. Step 6: Final answer
    x = 398.48

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Find fourth proportional to 242.60, 334.77 and 144.38
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Double scale
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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.