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Finding the Fourth Proportional to 973.18, 1,343.47 and 619.45

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Solution

The fourth proportional to 973.18, 1,343.47 and 619.45 is: 855.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.18 : 1,343.47 = 619.45 : x
  2. Step 2: Convert to fraction form
    973.18/1,343.47 = 619.45/x
  3. Step 3: Cross multiply
    973.18x = 1,343.47 × 619.45
  4. Step 4: Simplify right side
    973.18x = 832,212.49
  5. Step 5: Solve for x
    x = 832,212.49/973.18
  6. Step 6: Final answer
    x = 855.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.