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Finding the Fourth Proportional to 970.89, 1,455.88 and 312.64

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Solution

The fourth proportional to 970.89, 1,455.88 and 312.64 is: 468.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.89 : 1,455.88 = 312.64 : x
  2. Step 2: Convert to fraction form
    970.89/1,455.88 = 312.64/x
  3. Step 3: Cross multiply
    970.89x = 1,455.88 × 312.64
  4. Step 4: Simplify right side
    970.89x = 455,165.80
  5. Step 5: Solve for x
    x = 455,165.80/970.89
  6. Step 6: Final answer
    x = 468.81

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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.