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Finding the Fourth Proportional to 651.60, 898.76 and 389.40

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Solution

The fourth proportional to 651.60, 898.76 and 389.40 is: 537.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.60 : 898.76 = 389.40 : x
  2. Step 2: Convert to fraction form
    651.60/898.76 = 389.40/x
  3. Step 3: Cross multiply
    651.60x = 898.76 × 389.40
  4. Step 4: Simplify right side
    651.60x = 349,977.14
  5. Step 5: Solve for x
    x = 349,977.14/651.60
  6. Step 6: Final answer
    x = 537.10

Related Problems

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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.