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Finding the Fourth Proportional to 612.35, 918.86 and 407.02

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Solution

The fourth proportional to 612.35, 918.86 and 407.02 is: 610.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.35 : 918.86 = 407.02 : x
  2. Step 2: Convert to fraction form
    612.35/918.86 = 407.02/x
  3. Step 3: Cross multiply
    612.35x = 918.86 × 407.02
  4. Step 4: Simplify right side
    612.35x = 373,994.08
  5. Step 5: Solve for x
    x = 373,994.08/612.35
  6. Step 6: Final answer
    x = 610.75

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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.