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Finding the Fourth Proportional to 556.76, 766.98 and 390.66

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Solution

The fourth proportional to 556.76, 766.98 and 390.66 is: 538.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.76 : 766.98 = 390.66 : x
  2. Step 2: Convert to fraction form
    556.76/766.98 = 390.66/x
  3. Step 3: Cross multiply
    556.76x = 766.98 × 390.66
  4. Step 4: Simplify right side
    556.76x = 299,628.41
  5. Step 5: Solve for x
    x = 299,628.41/556.76
  6. Step 6: Final answer
    x = 538.16

Related Problems

Find fourth proportional to 278.38, 383.49 and 195.33
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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.