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Finding the Fourth Proportional to 390,853.60, 586,280.40 and 201,896.80

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Solution

The fourth proportional to 390,853.60, 586,280.40 and 201,896.80 is: 302,845.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,853.60 : 586,280.40 = 201,896.80 : x
  2. Step 2: Convert to fraction form
    390,853.60/586,280.40 = 201,896.80/x
  3. Step 3: Cross multiply
    390,853.60x = 586,280.40 × 201,896.80
  4. Step 4: Simplify right side
    390,853.60x = 118,368,136,662.72
  5. Step 5: Solve for x
    x = 118,368,136,662.72/390,853.60
  6. Step 6: Final answer
    x = 302,845.20

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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.