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Finding the Fourth Proportional to 978.61, 1,466.53 and 515.45

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Solution

The fourth proportional to 978.61, 1,466.53 and 515.45 is: 772.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.61 : 1,466.53 = 515.45 : x
  2. Step 2: Convert to fraction form
    978.61/1,466.53 = 515.45/x
  3. Step 3: Cross multiply
    978.61x = 1,466.53 × 515.45
  4. Step 4: Simplify right side
    978.61x = 755,922.89
  5. Step 5: Solve for x
    x = 755,922.89/978.61
  6. Step 6: Final answer
    x = 772.45

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