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Finding the Fourth Proportional to 1,145.57, 1,718.35 and 415.67

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Solution

The fourth proportional to 1,145.57, 1,718.35 and 415.67 is: 623.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.57 : 1,718.35 = 415.67 : x
  2. Step 2: Convert to fraction form
    1,145.57/1,718.35 = 415.67/x
  3. Step 3: Cross multiply
    1,145.57x = 1,718.35 × 415.67
  4. Step 4: Simplify right side
    1,145.57x = 714,256.91
  5. Step 5: Solve for x
    x = 714,256.91/1,145.57
  6. Step 6: Final answer
    x = 623.50

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Double scale
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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.