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Finding the Fourth Proportional to 1,570.60, 2,355.21 and 790.30

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Solution

The fourth proportional to 1,570.60, 2,355.21 and 790.30 is: 1,185.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.60 : 2,355.21 = 790.30 : x
  2. Step 2: Convert to fraction form
    1,570.60/2,355.21 = 790.30/x
  3. Step 3: Cross multiply
    1,570.60x = 2,355.21 × 790.30
  4. Step 4: Simplify right side
    1,570.60x = 1,861,322.46
  5. Step 5: Solve for x
    x = 1,861,322.46/1,570.60
  6. Step 6: Final answer
    x = 1,185.10

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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.