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Finding the Fourth Proportional to 612.64, 918.32 and 430.16

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Solution

The fourth proportional to 612.64, 918.32 and 430.16 is: 644.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.64 : 918.32 = 430.16 : x
  2. Step 2: Convert to fraction form
    612.64/918.32 = 430.16/x
  3. Step 3: Cross multiply
    612.64x = 918.32 × 430.16
  4. Step 4: Simplify right side
    612.64x = 395,024.53
  5. Step 5: Solve for x
    x = 395,024.53/612.64
  6. Step 6: Final answer
    x = 644.79

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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.