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Finding the Fourth Proportional to 946.89, 1,420.61 and 810.81

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Solution

The fourth proportional to 946.89, 1,420.61 and 810.81 is: 1,216.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.89 : 1,420.61 = 810.81 : x
  2. Step 2: Convert to fraction form
    946.89/1,420.61 = 810.81/x
  3. Step 3: Cross multiply
    946.89x = 1,420.61 × 810.81
  4. Step 4: Simplify right side
    946.89x = 1,151,840.74
  5. Step 5: Solve for x
    x = 1,151,840.74/946.89
  6. Step 6: Final answer
    x = 1,216.45

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1.5x scale

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.