Finding the Fourth Proportional to 712,584,658.80, 1,068,876,988.20 and 643,709,905.20
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Solution
The fourth proportional to 712,584,658.80, 1,068,876,988.20 and 643,709,905.20 is: 965,564,857.80
Step by Step Solution
- Step 1: Write the proportion equation
712,584,658.80 : 1,068,876,988.20 = 643,709,905.20 : x - Step 2: Convert to fraction form
712,584,658.80/1,068,876,988.20 = 643,709,905.20/x - Step 3: Cross multiply
712,584,658.80x = 1,068,876,988.20 × 643,709,905.20 - Step 4: Simplify right side
712,584,658.80x = 688,046,704,744,683,648 - Step 5: Solve for x
x = 688,046,704,744,683,648/712,584,658.80 - Step 6: Final answer
x = 965,564,857.80
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Double scale
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Similar ratio
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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.