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Finding the Fourth Proportional to 7,129.84, 9,840.45 and 4,297.72

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Solution

The fourth proportional to 7,129.84, 9,840.45 and 4,297.72 is: 5,931.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.84 : 9,840.45 = 4,297.72 : x
  2. Step 2: Convert to fraction form
    7,129.84/9,840.45 = 4,297.72/x
  3. Step 3: Cross multiply
    7,129.84x = 9,840.45 × 4,297.72
  4. Step 4: Simplify right side
    7,129.84x = 42,291,498.77
  5. Step 5: Solve for x
    x = 42,291,498.77/7,129.84
  6. Step 6: Final answer
    x = 5,931.62

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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.