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Finding the Fourth Proportional to 390,005.90, 538,458.27 and 318,557.42

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Solution

The fourth proportional to 390,005.90, 538,458.27 and 318,557.42 is: 439,813.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,005.90 : 538,458.27 = 318,557.42 : x
  2. Step 2: Convert to fraction form
    390,005.90/538,458.27 = 318,557.42/x
  3. Step 3: Cross multiply
    390,005.90x = 538,458.27 × 318,557.42
  4. Step 4: Simplify right side
    390,005.90x = 171,529,877,268.86
  5. Step 5: Solve for x
    x = 171,529,877,268.86/390,005.90
  6. Step 6: Final answer
    x = 439,813.54

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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.