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Finding the Fourth Proportional to 977.10, 1,349.94 and 899.34

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Solution

The fourth proportional to 977.10, 1,349.94 and 899.34 is: 1,242.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.10 : 1,349.94 = 899.34 : x
  2. Step 2: Convert to fraction form
    977.10/1,349.94 = 899.34/x
  3. Step 3: Cross multiply
    977.10x = 1,349.94 × 899.34
  4. Step 4: Simplify right side
    977.10x = 1,214,055.04
  5. Step 5: Solve for x
    x = 1,214,055.04/977.10
  6. Step 6: Final answer
    x = 1,242.51

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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.