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Finding the Fourth Proportional to 390,755.48, 539,271.59 and 218,690.72

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Solution

The fourth proportional to 390,755.48, 539,271.59 and 218,690.72 is: 301,809.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,755.48 : 539,271.59 = 218,690.72 : x
  2. Step 2: Convert to fraction form
    390,755.48/539,271.59 = 218,690.72/x
  3. Step 3: Cross multiply
    390,755.48x = 539,271.59 × 218,690.72
  4. Step 4: Simplify right side
    390,755.48x = 117,933,692,547.37
  5. Step 5: Solve for x
    x = 117,933,692,547.37/390,755.48
  6. Step 6: Final answer
    x = 301,809.44

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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.