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Finding the Fourth Proportional to 631.02, 946.80 and 521.40

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Solution

The fourth proportional to 631.02, 946.80 and 521.40 is: 782.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.02 : 946.80 = 521.40 : x
  2. Step 2: Convert to fraction form
    631.02/946.80 = 521.40/x
  3. Step 3: Cross multiply
    631.02x = 946.80 × 521.40
  4. Step 4: Simplify right side
    631.02x = 493,661.52
  5. Step 5: Solve for x
    x = 493,661.52/631.02
  6. Step 6: Final answer
    x = 782.32

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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.