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Finding the Fourth Proportional to 469.19, 647.70 and 312.10

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Solution

The fourth proportional to 469.19, 647.70 and 312.10 is: 430.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.19 : 647.70 = 312.10 : x
  2. Step 2: Convert to fraction form
    469.19/647.70 = 312.10/x
  3. Step 3: Cross multiply
    469.19x = 647.70 × 312.10
  4. Step 4: Simplify right side
    469.19x = 202,148.02
  5. Step 5: Solve for x
    x = 202,148.02/469.19
  6. Step 6: Final answer
    x = 430.84

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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.