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Finding the Fourth Proportional to 1,210.23, 1,670.47 and 790.65

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Solution

The fourth proportional to 1,210.23, 1,670.47 and 790.65 is: 1,091.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.23 : 1,670.47 = 790.65 : x
  2. Step 2: Convert to fraction form
    1,210.23/1,670.47 = 790.65/x
  3. Step 3: Cross multiply
    1,210.23x = 1,670.47 × 790.65
  4. Step 4: Simplify right side
    1,210.23x = 1,320,748.75
  5. Step 5: Solve for x
    x = 1,320,748.75/1,210.23
  6. Step 6: Final answer
    x = 1,091.32

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Double scale
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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.