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Finding the Fourth Proportional to 977.72, 1,345.73 and 810.05

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Solution

The fourth proportional to 977.72, 1,345.73 and 810.05 is: 1,114.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.72 : 1,345.73 = 810.05 : x
  2. Step 2: Convert to fraction form
    977.72/1,345.73 = 810.05/x
  3. Step 3: Cross multiply
    977.72x = 1,345.73 × 810.05
  4. Step 4: Simplify right side
    977.72x = 1,090,097.81
  5. Step 5: Solve for x
    x = 1,090,097.81/977.72
  6. Step 6: Final answer
    x = 1,114.94

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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.