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Finding the Fourth Proportional to 1,430.08, 1,973.60 and 809.28

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Solution

The fourth proportional to 1,430.08, 1,973.60 and 809.28 is: 1,116.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.08 : 1,973.60 = 809.28 : x
  2. Step 2: Convert to fraction form
    1,430.08/1,973.60 = 809.28/x
  3. Step 3: Cross multiply
    1,430.08x = 1,973.60 × 809.28
  4. Step 4: Simplify right side
    1,430.08x = 1,597,195.01
  5. Step 5: Solve for x
    x = 1,597,195.01/1,430.08
  6. Step 6: Final answer
    x = 1,116.86

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1.5x scale

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.