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Finding the Fourth Proportional to 469.34, 647.09 and 385.01

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Solution

The fourth proportional to 469.34, 647.09 and 385.01 is: 530.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.34 : 647.09 = 385.01 : x
  2. Step 2: Convert to fraction form
    469.34/647.09 = 385.01/x
  3. Step 3: Cross multiply
    469.34x = 647.09 × 385.01
  4. Step 4: Simplify right side
    469.34x = 249,130.96
  5. Step 5: Solve for x
    x = 249,130.96/469.34
  6. Step 6: Final answer
    x = 530.81

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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.