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Finding the Fourth Proportional to 985.40, 1,477.99 and 619.08

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Solution

The fourth proportional to 985.40, 1,477.99 and 619.08 is: 928.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.40 : 1,477.99 = 619.08 : x
  2. Step 2: Convert to fraction form
    985.40/1,477.99 = 619.08/x
  3. Step 3: Cross multiply
    985.40x = 1,477.99 × 619.08
  4. Step 4: Simplify right side
    985.40x = 914,994.05
  5. Step 5: Solve for x
    x = 914,994.05/985.40
  6. Step 6: Final answer
    x = 928.55

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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.