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Finding the Fourth Proportional to 830.08, 1,242.80 and 646.64

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Solution

The fourth proportional to 830.08, 1,242.80 and 646.64 is: 968.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.08 : 1,242.80 = 646.64 : x
  2. Step 2: Convert to fraction form
    830.08/1,242.80 = 646.64/x
  3. Step 3: Cross multiply
    830.08x = 1,242.80 × 646.64
  4. Step 4: Simplify right side
    830.08x = 803,644.19
  5. Step 5: Solve for x
    x = 803,644.19/830.08
  6. Step 6: Final answer
    x = 968.15

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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.