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Finding the Fourth Proportional to 667.51, 921.20 and 368.76

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Solution

The fourth proportional to 667.51, 921.20 and 368.76 is: 508.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.51 : 921.20 = 368.76 : x
  2. Step 2: Convert to fraction form
    667.51/921.20 = 368.76/x
  3. Step 3: Cross multiply
    667.51x = 921.20 × 368.76
  4. Step 4: Simplify right side
    667.51x = 339,701.71
  5. Step 5: Solve for x
    x = 339,701.71/667.51
  6. Step 6: Final answer
    x = 508.91

Related Problems

Find fourth proportional to 333.76, 460.60 and 184.38
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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.