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Finding the Fourth Proportional to 390,085.80, 546,857.40 and 390,085.80

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Solution

The fourth proportional to 390,085.80, 546,857.40 and 390,085.80 is: 546,857.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,085.80 : 546,857.40 = 390,085.80 : x
  2. Step 2: Convert to fraction form
    390,085.80/546,857.40 = 390,085.80/x
  3. Step 3: Cross multiply
    390,085.80x = 546,857.40 × 390,085.80
  4. Step 4: Simplify right side
    390,085.80x = 213,321,306,364.92
  5. Step 5: Solve for x
    x = 213,321,306,364.92/390,085.80
  6. Step 6: Final answer
    x = 546,857.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.