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Finding the Fourth Proportional to 1,298.30, 1,788.63 and 904.64

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Solution

The fourth proportional to 1,298.30, 1,788.63 and 904.64 is: 1,246.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.30 : 1,788.63 = 904.64 : x
  2. Step 2: Convert to fraction form
    1,298.30/1,788.63 = 904.64/x
  3. Step 3: Cross multiply
    1,298.30x = 1,788.63 × 904.64
  4. Step 4: Simplify right side
    1,298.30x = 1,618,066.24
  5. Step 5: Solve for x
    x = 1,618,066.24/1,298.30
  6. Step 6: Final answer
    x = 1,246.30

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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.