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Finding the Fourth Proportional to 390,935.60, 586,403.40 and 266,519.60

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Solution

The fourth proportional to 390,935.60, 586,403.40 and 266,519.60 is: 399,779.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,935.60 : 586,403.40 = 266,519.60 : x
  2. Step 2: Convert to fraction form
    390,935.60/586,403.40 = 266,519.60/x
  3. Step 3: Cross multiply
    390,935.60x = 586,403.40 × 266,519.60
  4. Step 4: Simplify right side
    390,935.60x = 156,287,999,606.64
  5. Step 5: Solve for x
    x = 156,287,999,606.64/390,935.60
  6. Step 6: Final answer
    x = 399,779.40

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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.