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Finding the Fourth Proportional to 665.01, 915.54 and 554.31

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Solution

The fourth proportional to 665.01, 915.54 and 554.31 is: 763.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.01 : 915.54 = 554.31 : x
  2. Step 2: Convert to fraction form
    665.01/915.54 = 554.31/x
  3. Step 3: Cross multiply
    665.01x = 915.54 × 554.31
  4. Step 4: Simplify right side
    665.01x = 507,492.98
  5. Step 5: Solve for x
    x = 507,492.98/665.01
  6. Step 6: Final answer
    x = 763.14

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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.