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Finding the Fourth Proportional to 612.34, 918.51 and 430.55

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Solution

The fourth proportional to 612.34, 918.51 and 430.55 is: 645.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.34 : 918.51 = 430.55 : x
  2. Step 2: Convert to fraction form
    612.34/918.51 = 430.55/x
  3. Step 3: Cross multiply
    612.34x = 918.51 × 430.55
  4. Step 4: Simplify right side
    612.34x = 395,459.89
  5. Step 5: Solve for x
    x = 395,459.89/612.34
  6. Step 6: Final answer
    x = 645.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.