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Finding the Fourth Proportional to 978.00, 1,464.95 and 430.57

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Solution

The fourth proportional to 978.00, 1,464.95 and 430.57 is: 644.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.00 : 1,464.95 = 430.57 : x
  2. Step 2: Convert to fraction form
    978.00/1,464.95 = 430.57/x
  3. Step 3: Cross multiply
    978.00x = 1,464.95 × 430.57
  4. Step 4: Simplify right side
    978.00x = 630,756.37
  5. Step 5: Solve for x
    x = 630,756.37/978.00
  6. Step 6: Final answer
    x = 644.95

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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.