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Finding the Fourth Proportional to 420,201.63, 630,307.93 and 139,718.88

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Solution

The fourth proportional to 420,201.63, 630,307.93 and 139,718.88 is: 209,580.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,201.63 : 630,307.93 = 139,718.88 : x
  2. Step 2: Convert to fraction form
    420,201.63/630,307.93 = 139,718.88/x
  3. Step 3: Cross multiply
    420,201.63x = 630,307.93 × 139,718.88
  4. Step 4: Simplify right side
    420,201.63x = 88,065,918,034.72
  5. Step 5: Solve for x
    x = 88,065,918,034.72/420,201.63
  6. Step 6: Final answer
    x = 209,580.14

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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.