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Finding the Fourth Proportional to 1,316.57, 1,973.16 and 621.69

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Solution

The fourth proportional to 1,316.57, 1,973.16 and 621.69 is: 931.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.57 : 1,973.16 = 621.69 : x
  2. Step 2: Convert to fraction form
    1,316.57/1,973.16 = 621.69/x
  3. Step 3: Cross multiply
    1,316.57x = 1,973.16 × 621.69
  4. Step 4: Simplify right side
    1,316.57x = 1,226,693.84
  5. Step 5: Solve for x
    x = 1,226,693.84/1,316.57
  6. Step 6: Final answer
    x = 931.74

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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.