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Finding the Fourth Proportional to 208,307.90, 287,461.50 and 112,813.76

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Solution

The fourth proportional to 208,307.90, 287,461.50 and 112,813.76 is: 155,681.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,307.90 : 287,461.50 = 112,813.76 : x
  2. Step 2: Convert to fraction form
    208,307.90/287,461.50 = 112,813.76/x
  3. Step 3: Cross multiply
    208,307.90x = 287,461.50 × 112,813.76
  4. Step 4: Simplify right side
    208,307.90x = 32,429,612,670.24
  5. Step 5: Solve for x
    x = 32,429,612,670.24/208,307.90
  6. Step 6: Final answer
    x = 155,681.15

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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.